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Subject3.11.4: kernel BUG at fs/buffer.c:1268
This is a newly built machine (although out of "tested" parts), so RAM
problems are not unthinkable, but I had the chance to capture this so
it seemed worth reporting.

i7-2xxx CPU, 8GB RAM, file system is ext4 on RAID-1.
The local patches are to a char device driver (remote control/rf
subsystem) that isn't even active ATM.

The BUG, BTW, is
static inline void check_irqs_on(void)
{
#ifdef irqs_disabled
BUG_ON(irqs_disabled());
#endif
}

I'm not sure which config options are most important.
One that comes to mind is CONFIG_PREEMPT_VOLUNTARY=y


[88395.501925] ------------[ cut here ]------------
[88395.501952] kernel BUG at fs/buffer.c:1268!
[88395.501970] invalid opcode: 0000 [#1] SMP
[88395.501992] Modules linked in: battery nfsd exportfs fuse ftdi_sio usbserial r8169 aesni_intel aes_x86_64 ablk_helper cryptd iTCO_wdt lrw gf128mul glue_helper mii
[88395.502089] CPU: 0 PID: 4971 Comm: iceweasel Not tainted 3.11.4-00008-g9838365 #97
[88395.502125] Hardware name: Gigabyte Technology Co., Ltd. Z68A-D3H-B3/Z68A-D3H-B3, BIOS F13 03/20/2012
[88395.502168] task: ffff880210b62080 ti: ffff8802014cc000 task.ti: ffff8802014cc000
[88395.502194] RIP: 0010:[<ffffffff810e115a>] [<ffffffff810e115a>] check_irqs_on+0xb/0xf
[88395.502226] RSP: 0018:ffff8802014cd6e0 EFLAGS: 00210046
[88395.502245] RAX: 0000000000200086 RBX: 0000000000001000 RCX: ffff8802146e8000
[88395.502269] RDX: 0000000000001000 RSI: 0000000000d00206 RDI: ffff8802165789c0
[88395.502293] RBP: ffff8802014cd6e0 R08: 00000000000001a3 R09: 0000000000000003
[88395.502317] R10: 0000000000000003 R11: ffff88020b265ae0 R12: ffff8802165789c0
[88395.502341] R13: 0000000000d00206 R14: ffff88020092c920 R15: ffff880216ace400
[88395.502365] FS: 0000000000000000(0000) GS:ffff88021fa00000(0000) knlGS:0000000000000000
[88395.502393] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
[88395.502413] CR2: 0000000000000000 CR3: 0000000001614000 CR4: 00000000000407f0
[88395.502436] Stack:
[88395.502444] ffff8802014cd750 ffffffff810e136d ffffea000305e900 ffff8802014cd7a8
[88395.502473] 0000000000200292 ffff8802014cd788 ffff8802014cd720 ffffffff811af692
[88395.502501] ffff8802014cd750 ffffffff8108aeba 0000000000000010 0000000000001000
[88395.502530] Call Trace:
[88395.502541] [<ffffffff810e136d>] __find_get_block+0x1c/0x176
[88395.502563] [<ffffffff811af692>] ? radix_tree_lookup_slot+0xe/0x10
[88395.502586] [<ffffffff8108aeba>] ? find_get_page+0x41/0x63
[88395.502606] [<ffffffff810e24cd>] __getblk+0x20/0x27e
[88395.502625] [<ffffffff8111411d>] __ext4_get_inode_loc+0xf5/0x32f
[88395.502646] [<ffffffff81115ba7>] ext4_get_inode_loc+0x29/0x2e
[88395.502667] [<ffffffff81117347>] ext4_reserve_inode_write+0x1f/0x7a
[88395.502690] [<ffffffff811173d8>] ext4_mark_inode_dirty+0x36/0x19b
[88395.502713] [<ffffffff8113f773>] ? jbd2_journal_dirty_metadata+0x1b5/0x1f0
[88395.502737] [<ffffffff81128f99>] __ext4_ext_dirty+0x5a/0x63
[88395.502758] [<ffffffff8112a67b>] ext4_ext_insert_extent+0xd8f/0xdcf
[88395.502780] [<ffffffff8112c9ab>] ext4_ext_map_blocks+0xc68/0xe01
[88395.502802] [<ffffffff81115607>] ext4_map_blocks+0x27b/0x42b
[88395.502823] [<ffffffff811178f5>] ext4_writepages+0x3b8/0x814
[88395.502844] [<ffffffff81436b02>] ? _raw_spin_lock+0x9/0xb
[88395.502865] [<ffffffff81092550>] do_writepages+0x19/0x27
[88395.502884] [<ffffffff8108baf1>] __filemap_fdatawrite_range+0x50/0x52
[88395.502907] [<ffffffff8108bb0a>] filemap_flush+0x17/0x19
[88395.502926] [<ffffffff81115a21>] ext4_alloc_da_blocks+0x21/0x23
[88395.502947] [<ffffffff81110c0b>] ext4_release_file+0x20/0x95
[88395.502968] [<ffffffff810c14cd>] __fput+0xf2/0x1cb
[88395.502985] [<ffffffff810c15d2>] ____fput+0x9/0xb
[88395.503003] [<ffffffff81041d3a>] task_work_run+0x78/0x8e
[88395.503023] [<ffffffff8102ea67>] do_exit+0x378/0x841
[88395.503042] [<ffffffff81036712>] ? __sigqueue_free+0x34/0x37
[88395.503062] [<ffffffff81036b15>] ? __dequeue_signal+0xa8/0xfd
[88395.503083] [<ffffffff8102fa32>] do_group_exit+0x3f/0x95
[88395.503103] [<ffffffff81038d53>] get_signal_to_deliver+0x423/0x443
[88395.503125] [<ffffffff81001cf0>] do_signal+0x44/0x5c3
[88395.503144] [<ffffffff81037d59>] ? do_send_sig_info+0x58/0x6d
[88395.503165] [<ffffffff81002294>] do_notify_resume+0x25/0x58
[88395.503185] [<ffffffff814376e0>] int_signal+0x12/0x17
[88395.503203] Code: 80 4d 00 20 4d 8b 6d 08 48 ff c3 4c 3b 6d d0 75 b7 5a 4c 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 55 48 89 e5 9c 58 f6 c4 02 75 02 <0f> 0b 5d c3 55 48 81 fa ff 0f 00 00 48 89 e5 48 89 77 10 76 02
[88395.503336] RIP [<ffffffff810e115a>] check_irqs_on+0xb/0xf
[88395.503356] RSP <ffff8802014cd6e0>
[88395.511861] ---[ end trace 2480df9f92ab983b ]---
[88395.511862] Fixing recursive fault but reboot is needed!



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